Profile Tolerancing Applications Flashcards
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Read the first 7 Profile Tolerancing Applications flashcards as text
A composite profile tolerance uses two segments in the feature control frame. What does the upper segment control?
Answer: Location of the pattern relative to the datums
In a composite profile tolerance, the upper segment (PLTZF) controls the location of the entire pattern relative to the datum reference frame.
For a composite profile tolerance, the lower segment feature-relating tolerance zone framework (FRTZF) primarily controls:
Answer: The relationship of features within the pattern to each other
The FRTZF (lower segment) controls the feature-to-feature relationship within the pattern, ensuring features are correctly spaced relative to one another.
Which statement is TRUE about Profile of a Line vs. Profile of a Surface?
Answer: Profile of a line controls individual cross-sectional elements; profile of a surface controls the entire surface
Profile of a line controls each individual cross-sectional line element of a surface, while profile of a surface controls the entire surface simultaneously.
When specifying a non-uniform profile tolerance using ASME Y14.5-2018, which notation is used?
Answer: NON-UNI placed before the tolerance value in the feature control frame
ASME Y14.5-2018 introduced the NON-UNI modifier placed before the tolerance value to indicate a non-uniform profile tolerance zone.
A profile of a surface callout with a tolerance of 0.5 and datums A and B means the surface must lie between two boundaries how far apart?
Answer: 0.5 mm apart (0.25 each side for bilateral)
A bilateral profile tolerance of 0.5 creates a zone 0.5 mm wide total, with boundaries 0.25 mm on each side of the true profile.
Profile tolerancing is most commonly used instead of coordinate tolerancing when:
Answer: The part has complex curved or freeform surfaces that cannot be defined by simple ± dimensions
Profile tolerancing excels at controlling complex curved or freeform surfaces where traditional ± coordinate dimensions would be ambiguous or impractical.
Which of the following best describes how the true profile is defined for a profile tolerance?
Answer: By the basic dimensions shown on the drawing
The true profile is defined by the basic (theoretically exact) dimensions shown on the drawing, from which the tolerance zone boundaries are offset.